refactor: reuse market symbol normalization

app/backend/features/market/charts.py

@@ -12,6 +12,7 @@ from datetime import datetime, time as dt_time, timedelta
 from threading import Lock
 from typing import Any, ClassVar
 
+from backend.bootstrap.config import tushare_code as _stock_market_code
 from backend.data.providers.ifind_client import IfindError, IfindHttpClient
 
 
@@ -475,16 +476,6 @@ def _ifind_point(row: dict[str, Any]) -> dict[str, Any] | None:
     }
 
 
-def _stock_market_code(code: str) -> str:
-    if code.startswith(("4", "8", "9")):
-        suffix = "BJ"
-    elif code.startswith("6"):
-        suffix = "SH"
-    else:
-        suffix = "SZ"
-    return f"{code}.{suffix}"
-
-
 def _number(value: Any) -> float:
     try:
         return float(value or 0)